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s. P. PARKER LOOM Filed May 7. 1942 2 Sheets-Sheet 2 I/VI ENTOR 'SIZMUEL R PAR/(ER 8 W A6 NT Patented Aug. 14, 1945 LOOM 7 Samuel P. Parker,La Grange, Ga., assignor to Callaway Mills, La Grange, Ga., acorporation of Georgia Application May 7, 1942, Serial No. 442,025

Claims.

This invention relates to looms,and, more particularly to warp stopmotions for pile looms.

The invention will be described as used on a loom adapted to weave aterry fabric.

Heretofore, warp stop motions using drop wireshave been unsatisfactorywhen used on terry warp because of the very slight tension under whichthis warp operates. The usual drop wires, when used with a terry warp,are held upward by their warp threads for a small number of picks, but,after a short period of operation, the terry warp yarns sag sufficientlyto allow the drop wires to move down to the position in which they areeffective to stop the loom.

It is accordingly an object of this invention to provide a, mechanism torelieve the tension, applied by the drop wires, on the terry warp atregular intervals, so that stoppage of the loom as a result of saggingof the terry warp yarns rather than breakage thereof is prevented.

Other objects, advantages, and novel features of the invention willbecome more apparent from the following description of the illustrativeembodiment shown in the accompanying drawing, in which:

Figure 1 is a perspective view of a stop motion embodying the inventionas applied to a loom.

Figures 2, 3, and 4 are, respectively, front elevational, top plan, andside elevational views of the new stop motion, and Figures 5 and 6 arefragmentary sectional views showing motion in different positions.

In Figure 1, a portion of the well-known loom mechanism is shown and itincludes the cam parts of the stop shaft I, center brace supports 3, acenter brace 4 3 20, rigidly'attached to shaft 2I.- Shaft 2| isrotatably mounted in any desired manner. Rigidly fastened to shaft 2| iscam 22,-whose function will be described later.

A shaft 23 is provided, and is journalled at 24 and 25. A lever 26 issecured to theshaft 23,

and has pivotally attached to it a downwardly extending rod 21. Rod 2!passes through a hole in bracket 28 which is secured to the loom side,

not shown. A collar 29 is secured to rod 21 at which are bifurcated attheir ends. Vertical rods 32 are pivotally secured at their lower endsto the bifurcated ends of lever arms 3|. Resting horizontally in theupper bifurcated ends of rods 32 and held into position by means of pins33 is a contact bar 34, which cooperates with the .drop

for a group of contact bars generally designated 5, a bar separator I, astop motion cam 8 on camshaft I, cam lever 9, levers I 0 and II and rodsI2 and I3 fOr actuating knock-off lever I4, and knock-off case l5. Asall this mechanism is old in the art, it will not be necessary todescribe it further than to state that the usual drop Wires (not shown)are to be provided for making contact between the two members of eachcontact bar 5. When the drop wires are permitted to fall, as uponbreakage of a strand of warp yarn, an electric circuit is closedenergizing an electromagnet in case I5, which permits knock-ofl lever I4 to engage and operate the shipper handle (not shown) to stop the loom.

The new stop motion as shown in the drawings comprises a spur gear I8,rigidly secured to one of the rotating shafts of the loom. This shaft isindicated at I9 and may be coincident with cam shaft I. Spur gear I8drives another spur gear wires carried by the terry warp yarns.

The contact bars 5 are constructed in the usual manner with an innermetallic member insulated from an outer metallic member 36. The innermembers of all the bars, except bar 34, are normallycharged and theouter members of all the bars are grounded through the loom frame.Secured at one end to an extension of the inner member of contact bar 34is a metallic bracket 31, adapted to engage a similar extension of theinner member of contact bar 40, when the bar 34 is in its down position,and cause the inner member of bar 34 to be charged. When contact is madeby one of the drop wires between the inner and outer members of bar 34,when that bar is in its down position, the loom is automatically stoppedin the usual manner.

The difficulty in connection with the use ofdrop wires on the pile warpof a terry loom is well known to operators of such looms. The pile warpis under such slight tension that if drop wires and contact bars wereused in the usual manner, the drop wires would gradually fall, thusstopping the loom when no break in the pile warp had occurred. It hasbeen found that the terry warp yarns will keep the drop wires out ofengagement with the contact bars during the inser-- tion of severalpicks in the fabric, after which the sagging of the yarns will allow thedrop wires to engage the contact bars and stop the loom. Accordingly, ifthe pull of the drop wires on the terry warp yarns is relieved for mostof the time, as, for example, during the insertion of ten out of everytwelve picks, those drop wires will fall and cam 22 engages rod 21 andis so designed asto;

force rod 21 upward and hold the rod 21 in the upward position for aboutone sixth of a revolution of the cam 22. ward by cam 22, it rocks shaft23 through lever arm 26, andthis causes the bifurcated end of lever arm3| to move downward, thus carrying the contact bar 34 downward by meansof rod 32. When bar 34 is in its down position, its inner member 35becomes energized by engagement of bracket 31 with the inner member ofcontact bar and the drop wires associated with bar 34 are supportedwholly by the terry warp yarns.

During operation, the rod 21 isin the upward position for approximatelytwo picks of the loom,

after which time, the rod is forced downward by spring 30, rotatingshaft 23 in the direction opposite to that mentioned above, thus raisingconmeans for moving the bar between upper and lower positions atregularly recurring intervals,

When rod 21 is moved uptact bar 34' and disengaging it electrically fromcontact'bar 40 When the contact bar 34 is in its upper position, the barengages its drop wires 4| and supports'them so that the terry warp yarns42 are relieved'of the 'weight of the drop wires. Whenthe parts are inthis relation, the drop wires bridge the inner and outer members of thecontact bar, but since the inner member is not charged, the loom is notstopped. When bar 34 is in its down position and its inner member ischarged byv reason of the engagement of projection 31 with the innermember of the adjacent stationary bar, the breakage of a warp yarn willpermit its drop wire 4i to fall andbridge the inner and outer members ofbar 34. This will cause a flow of current which will bring about thestopping of the loom.

While only one embodiment of the invention has been shown and described,it is not intended the scope of the invention be limited thereby, norotherwisev than by the terms of the appended claims. I

What is claimed is: v i

l. A warp stop motion for a loom comprising a vertically reciprocatablecontactbar, a rotatably driven cam and means operated by said cam and soconstructed and arranged as to reciprocate said contact bar into and-outof operating position at regularly recurring intervals.

drop wires engaging individual warp yarns and being supported whollythereby when the yarns are unbroken and the bar is in its lowerposition, the bar in its upper position supporting the wires andrelieving the warp yarns of the weight of the wires, and means operablewhen the bar is in its lower position only for charging the inner memberof the bar. v t

4. A warp stop motion for a loom, which comprises a vertically movablecontact bar having an inner and an outer member insulated from oneanother, the outer member being grounded,

means for movin the bar between upper and lower positions at regularlyrecurring intervals, the bar being held in its upper positionby saidmeans for a longer period than it is held in its lower position, dropwires engaging individual warp yarns and being supported wholly therebywhen the yarns are unbroken and the bar is in its lower position, thebar in its upper position supporting the wires and relieving the warpyarns of the weight of the wires, and means operable when'the bar is inits lower position only' for charging the inner member of the bar. 5. Awarp stop motion for a loom, which comprises a stationary contact barhaving an inner and an outer member insulated from eachother with theouter member grounded and the inner member charged, a vertically movablecontact bar adjacent the stationary bar and having an inner member andan outer member insulated from one another, the outer member ,beinggrounded, means for moving the movable .bar between upper andlo'werpositions, means. for electrically connecting the inner members of saidbars when the movable bar is in its lower position, and drop wiresengaging individual warp yarns and being supported wholly thereby whenthe yarns are unbroken and the movable bar is in its lower position, themovable bar in its upper position supporting thewires and relieving thewarp yarns of the weight of the wires. SAMUEL P. PARKER.

